/Engine/Source/Runtime/MovieScene/Public/Evaluation/MovieSceneEvaluationTree.h
Move assignment must ensure that the root node is correctly restored to its default to ensure that invariant
[FMovieSceneEvaluationTree](API\Runtime\MovieScene\Evaluation\FMovieSceneEvaluationTree) & operator= ( [FMovieSceneEvaluationTree](API\Runtime\MovieScene\Evaluation\FMovieSceneEvaluationTree) && RHS )